Thermostat

442olds · January 31

I have a 2018 Silverado with a 5.3.It has 104,000 miles and has been running well.I did have to put a transmission in it around 90,000.

Anyways,I don't think my temperature gauge is as high as it should be. I'm thinking about changing the thermostat. A quick search shows them being sold with the whole housing.Why are they selling them like that.Can't you just buy a thermostat?And I prefer GM parts.Anyone have a part number?

BO TIE 1 · January 31

Looks like that's how they come for our trucks. I checked gm parts direct

Water Pump Outlet Assembly with Thermostat - GM (12674639)

It's Tim · January 31

1 hour ago, 442olds said:

Why are they selling them like that.

$$$

15 Z71 · January 31

It's worth buying whole assembly. Takes about 15 minutes to change. I did mine over the summer. 3 10mm bolts and one clamp.

Grumpy Bear · January 31

I gutted the housing and installed this from IPSCO.ORG in the upper hose using a standard 54 mm SBC thermostat.

Allot of thermostat choices when done like this. I had them scallop it, but self-item is not so machined.

Currently running the Reische Racing 170F stat summer and winter.

Shown spliced into upper hose below.

16LT4 · February 6

On 1/31/2023 at 10:49 AM, 442olds said:

I have a 2018 Silverado with a 5.3.It has 104,000 miles and has been running well.I did have to put a transmission in it around 90,000.

Anyways,I don't think my temperature gauge is as high as it should be. I'm thinking about changing the thermostat. A quick search shows them being sold with the whole housing.Why are they selling them like that.Can't you just buy a thermostat?And I prefer GM parts.Anyone have a part number?

Does it matter? Replace the entire assembly, easy peasy. Mine was stuck open for who knows how long, and I just replaced it with Motorad 815194 from rock auto, the 194* T-stat in lieu of the stock 207* unit. $45, and easier to replace than a traditional thermostat (no RTV/gasket needed, the new houseing comes with an o-ring).

Before replacing that, however, I 1) replaced the temperature sending unit to ensure anything I'd see on the scantool was accurate and 2) looked at ECT on a scan tool. The dash gauge is hardly an accurate gauge.

442olds · February 6

I changed it this weekend.Very easy to do and now my gauge is right where it used to be.

There were no trouble codes.You just get used to where the gauge "used to be" and I think my thermostat was stuck open.Mileage seemed to be off a tad too,but it's all back to normal now.Thanks.